摘要：On January 21st, Shenzhen's first undersea tunnel, the Mawan undersea tunnel, officially opened. The Mawan tunnel is also the larg

On January 21st, Shenzhen's first undersea tunnel, the Mawan undersea tunnel, officially opened. The Mawan tunnel is also the largest diameter undersea shield tunnel project in China. Located in the western part of Qianhai, Shenzhen, the core engine city of the Guangdong-Hong Kong-Macao Greater Bay Area, the Mawan tunnel starts from Yueliangwan Boulevard, crosses Qianhai Bay, and ends at Xixiang Boulevard, with a total length of about 8.05 km.

The Mawan undersea tunnel

The tunnel is divided into two parts: underground and surface. The underground section is a city expressway with six lanes in both directions, designed for a speed of 80 km/h. The surface section is a major urban road, also with six lanes in both directions, designed for a speed of 40 km/h. It includes two undersea shield tunnels, with a maximum excavation diameter of 15.5 meters, making it the leading project in terms of scale among Chinese undersea shield tunnels.

As a key demonstration project for transportation connectivity in the Greater Bay Area, the construction of the Mawan undersea tunnel presented significant challenges. The construction team overcame numerous technical barriers with the help of innovation and intelligent construction techniques. They successfully tackled challenges such as large-scale pit construction in reclaimed land, undersea shield tunnel opposite and parallel intersections with large diameters, and shield tunneling through composite strata with soft upper layers and hard lower layers (with rock uniaxial compressive strength averaging 45 MPa and reaching up to 193 MPa).

The completion of the Mawan tunnel is of great significance. It enhances the external road network structure around Qianhai, Shenzhen. In addition to facilitating freight transportation in the Nanshan Port area, it also serves passenger traffic in regions like Chiwan, Mawan, and Dachen Bay. Moreover, it achieves the separation of passenger and freight traffic, and facilitates transit traffic in the Qianhai area, contributing significantly to the expansion and integration of urban development space, which plays a crucial role in improving the transportation network of the Qianhai area.

Source :Lingnan on the Cloud

深圳首条海底隧道——妈湾海底隧道正式通车

1月21日，深圳首条海底隧道——妈湾海底隧道正式通车。该隧道同时也是中国海底最大直径盾构隧道。妈湾海底隧道位于粤港澳大湾区核心引擎城市深圳西部前海，起于月亮湾大道，穿越前海湾后止于西乡大道，全长约8.05km。

隧道道路分为地下和地面两部分，地下为城市快速路，双向六车道，设计时速80km；地面是城市主干道，同样双向六车道，设计时速40km。其包含两条海底盾构隧道，最大开挖直径达15.5m，在国内海底盾构隧道中规模领先。

作为粤港澳大湾区互联互通、交通建设的重点示范工程，妈湾海底隧道的建造极具挑战性。建设团队通过技术创新与智能化建造，突破重重技术壁垒，开展科研攻关，成功克服填海区域超大基坑施工、超大直径盾构水下对向平行交会、上软下硬复合式地层盾构掘进（岩石单轴抗压强度平均值45MPa，最高达193MPa）等施工难题。

这条隧道的建成意义重大，它完善了深圳前海外部路网结构，不仅承担南山港区疏港货运交通任务，还兼顾赤湾、妈湾、大铲湾等片区的客运交通，实现前海片区客货分离与过境分离，有力推动城市发展空间的拓展与整合，对前海片区交通网络的完善起着举足轻重的作用。

文｜记者 宋王群

翻译 | 肖凯欣

英文审校 | 林佳岱

来源：羊城派